Fuel Lid Tight or Loose? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

JiB · 09-12-2012, 11:14 PM

I spent a few mins using the search function to try and find an answer, but no success!

I have always wondered about the fuel cap being tightened or left not air tight. I always leave it, loosing-ish, not air tight, my logic is that when the fuel is being drawn from the tank, if air tight there would be pressure that wont allow as much fuel to be sucked out.

That is just my logic, but i have no idea

What do you do and why? Or is there a way its suppose to be for a legit reason?

Thanks for the help!

smbrm · 09-12-2012, 11:39 PM

Fuel tanks don't usually breath through the cap. In fact you may even set off a cel, or so I have been lead to believe, if the cap is not tight?

pyro530 · 09-12-2012, 11:42 PM

Yeah, if you leave the cap loose for to long it WILL throw a CEL

sho220 · 09-12-2012, 11:44 PM

Quote:

Originally Posted by smbrm

Fuel tanks don't usually breath through the cap. In fact you may even set off a cel, or so I have been lead to believe, if the cap is not tight?

I've always heard the same thing. Never confirmed it though...

DaJo · 09-12-2012, 11:45 PM

The fuel cap needs to be tight! How do you know if it's tight? Twist until it clicks at you.

If you don't tighten your fuel cap it might cause issues with the evaporative emissions controls as the tank is currently permanently vented to the atmosphere and that can trigger a check engine light.

RallySport Direct · 09-12-2012, 11:47 PM

What others have said before, and if I remember correctly the newer cars will actually have a fuel pressure sensor in the tank, I assume for emission purposes. So I would imagine the cap has to be tight to help keep a consistent pressure in the tank.

Hope this helps

Thanks,
Rick

oops86 · 09-13-2012, 12:38 AM

Quote:

Originally Posted by DaJoian

The fuel cap needs to be tight! How do you know if it's tight? Twist until it clicks at you.

Weird. Mine doesn't click. Don't get me wrong, I turn that thing until I can't turn it any further, but I don't get any clicks.

DaJo · 09-13-2012, 12:41 AM

Quote:

Originally Posted by oops86

Weird. Mine doesn't click. Don't get me wrong, I turn that thing until I can't turn it any further, but I don't get any clicks.

That's weird...not even a click?? Could be a faulty cap...bring it back to the dealer...

My BRZ clicks just once and it doesn't let you tighten any further after that click.

oops86 · 09-13-2012, 12:43 AM

Quote:

Originally Posted by DaJoian

That's weird...not even a click?? Could be a faulty cap...bring it back to the dealer...

My BRZ clicks just once and it doesn't let you tighten any further after that click.

Not a click, not a peep, nothing.

CSSM · 09-13-2012, 12:45 AM

Quote:

Originally Posted by oops86

Weird. Mine doesn't click. Don't get me wrong, I turn that thing until I can't turn it any further, but I don't get any clicks.

Weird, even my 01 Tahoe will keep clicking after a point if I keep turning it

sho220 · 09-13-2012, 12:47 AM

Quote:

Originally Posted by DaJoian

That's weird...not even a click?? Could be a faulty cap...bring it back to the dealer...

My BRZ clicks just once and it doesn't let you tighten any further after that click.

Yeah...that doesn't sound right. FR-S is the same, it clicks once and then won't turn any more.

oops86 · 09-13-2012, 12:48 AM

Quote:

Originally Posted by DaJoian

That's weird...not even a click?? Could be a faulty cap...bring it back to the dealer...

My BRZ clicks just once and it doesn't let you tighten any further after that click.

Quote:

Originally Posted by CSSM

Weird, even my 01 Tahoe will keep clicking after a point if I keep turning it

Quote:

Originally Posted by sho220

Yeah...that doesn't sound right. FR-S is the same, it clicks once and then won't turn any more.

Nice. I'll have it looked at when I take it in for an oil change.

JiB · 09-13-2012, 12:49 AM

Ok, needless to say, i will will be tightening that cap when i get home

THANKS EVERYONE!

Hawaiian · 09-13-2012, 02:06 AM

Quote:

Originally Posted by sho220

I've always heard the same thing. Never confirmed it though...

My ex didn't tighten the cap on her XB and it definately threw a CEL.

09-12-2012, 11:14 PM	#1
JiB * Join Date: May 2012 Drives: GT86 Location: Sydney Posts: 845 Thanks: 525 Thanked 266 Times in 144 Posts Mentioned: 11 Post(s) Tagged: 0 Thread(s)	Fuel Lid Tight or Loose? I spent a few mins using the search function to try and find an answer, but no success! I have always wondered about the fuel cap being tightened or left not air tight. I always leave it, loosing-ish, not air tight, my logic is that when the fuel is being drawn from the tank, if air tight there would be pressure that wont allow as much fuel to be sucked out. That is just my logic, but i have no idea What do you do and why? Or is there a way its suppose to be for a legit reason? Thanks for the help! __________________

09-12-2012, 11:42 PM	#3
pyro530 Senior Member Join Date: Apr 2012 Drives: Ultramarine FR-S 6MT Location: Chico, CA Posts: 303 Thanks: 175 Thanked 102 Times in 46 Posts Mentioned: 1 Post(s) Tagged: 1 Thread(s)	Yeah, if you leave the cap loose for to long it WILL throw a CEL __________________ Current: FR-S Ultramarine 6MT - Took delivery 05/30/2012 - Now for sale here 1995 M3 Coupe MT - the "Bavarian Bumblebee" Past: 1994 Integra - Sold \| 2005 Dodge SRT-4 - Totaled by Hail \| 1997 Acura 2.2 CL slowmobile - Sold \| 1991 BMW E30 - Sold \| 1991 Acura Integra GS - Wrecked \| 1971 Chevy C-10 shortbed stepside - Sold \| 1973 Camaro Z-28 Clone - Stolen

09-12-2012, 11:45 PM	#5
DaJo FT86Club Vancouver Join Date: Jun 2012 Drives: BRZ Sport-Tech; Drove: MR-S, AE86 Location: Vancouver, BC Posts: 2,532 Thanks: 391 Thanked 1,179 Times in 633 Posts Mentioned: 16 Post(s) Tagged: 2 Thread(s)	The fuel cap needs to be tight! How do you know if it's tight? Twist until it clicks at you. If you don't tighten your fuel cap it might cause issues with the evaporative emissions controls as the tank is currently permanently vented to the atmosphere and that can trigger a check engine light. __________________ 1984 AE86 BT 20V 5MT 2007-2012 2000 MR-S 5MT 2010-2012 2013 BRZ Sport-Tech 6AT Since '12 (OEM+ STI tS Build) 2015 Lexus IS250 AWD F-Sport 2 2015-2018 2018 Lexus NX300 F-Sport 3 Since '18

09-13-2012, 12:49 AM	#13
JiB * Join Date: May 2012 Drives: GT86 Location: Sydney Posts: 845 Thanks: 525 Thanked 266 Times in 144 Posts Mentioned: 11 Post(s) Tagged: 0 Thread(s)	Ok, needless to say, i will will be tightening that cap when i get home THANKS EVERYONE! __________________

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09-12-2012, 11:39 PM	#2
smbrm Senior Member Join Date: May 2010 Drives: Scion FRS Ht Lva(AT) Location: Alberta Posts: 409 Thanks: 30 Thanked 81 Times in 54 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Fuel tanks don't usually breath through the cap. In fact you may even set off a cel, or so I have been lead to believe, if the cap is not tight?

09-12-2012, 11:47 PM	#6
RallySport Direct Join Date: Apr 2012 Drives: 2014 Widebody Cosworth FR-S Location: Salt Lake City, Utah Posts: 4,542 Thanks: 205 Thanked 1,198 Times in 554 Posts Mentioned: 38 Post(s) Tagged: 0 Thread(s)	What others have said before, and if I remember correctly the newer cars will actually have a fuel pressure sensor in the tank, I assume for emission purposes. So I would imagine the cap has to be tight to help keep a consistent pressure in the tank. Hope this helps Thanks, Rick

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